In response to the September 11, 2001 terrorist attack, President Bush issued an Executive Order
(September 21, 2001), providing, among other things, that every United States person is prohibited from making or receiving any contributions of funds, goods, or services to benefit of those persons listed on the Annex to the order
[this is a brochure and it may not be current, but it will provide you with some sense of the difficulty facing charities].
Apparently some tsunami relief organizations may run afoul of this order.
